Well it is not the light Bulb itself but it is the CO2 created in the generation of the electricity that the light bulb consumes. Now clearly the amount of C02 created will depend on the type and the efficiency of the power station which is worst for coal power stations but if your electricity is generated by wind power then your light bulb will not be responsible for creating any CO2 at all during its operation. But right now the majority of electricity is generated by coal powered stations so lets look at the figures for those.

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